I am assuming RI it is the most logical the usual progression is stretched straight out or elevated head, then clicks and pops noisy breathing most of the time and next is bubbles and last pen mouth breathing. RI is a huge range of things with similar symptoms some are treated the same some not the same (fungal RI over bacterial RI)

I have dealt with it a number of times as I help do rescues and many come in with RI. There is no definite pattern but the vet tech I work with sometimes usually says that at the bubbles home based treatment is not usually a good idea. I a just parroting my RVT.

The next important thing to think on is where it came from it is uncommon for RI to just happen with no trigger at all. Usually something related to husbandry. I know that Dr. J. Rossi and Dr. R. Klingenberg both have commented on high humidity and low ventilation causing RI. Top venting is poor at best air tends to flow across the path of least resistance across the top. That generates a stale air condition at the lower 1/3 of the tub, where the snake is. Personally I'd start adding holes in each end about 1/3 to 1/2 way down the side to increase air flow.

Condensation only occurs when you have warm to cool either warm tub sides against much cooler air or cool tub sides against warm air. then the water condenses on surfaces. No condensation is not an indicator of high humidity just humidity and temperature difference. Pull something out of the freezer you get frost on the surface. Humidity from the air freezes on the exterior.